+1 on keep coming back and trying. It will get easier. Try to hang just a b it further each week.

Also work on your pack riding skills. Pacelines inevitably surge and slow. Anticipate when those are going to happen so you can be smooth and use less energy.

Don't go to the front and pull. If you have to, pull through quickly (just long enough for the last guy who pulled to clear).

Learn the places you can save a bit of energy. For example you can let a small gap develop on an uphill that you know is immediately followed by a downhill.

Don't accelerate to close gaps when you know the group is going to slow anyway, and be prepared to start accelerating smoothly when the group is going to surge.

Find the biggest guy to get behind in the line.

Learning good technique helps make up for missing watts.